The seat shaft is too big for the seat pipe to tighten the seat.I'm small so I got the 20" wheels. My legs are long so the 24"might have fit me better, but am happy with the one I got. It is not a bulky as the other might been. If you know nothing about bikes make sure you have someone around to help you that does. It is not hard, you will have to be able to adjust brakes and gears. I love it. So much fun.First, packed brilliantly. This bike needs considerable assembly and if you are not mechanical it will be beyond you. It comes with just about all the tools you will need including the chain riveter and remover. The instruction are difficult as they are minimal. The pictures they include of the assembly are hard to make out. The parts are very well set up with bolts already in place and the big units like the rear axel are assembled, but do need to be placed onto the main frame. It took me about six hours to assemble over several days and I have assembled many bicycles . The folding mechanism is a bit stiff and needs a bit of muscle to operate. It is a good purchase for the money and I would recommend it.The chain connector is missing, the rear fenders are missing. Several scratches on frame and fenders.Additionally, The front splocket is bent so the chan falls off on some of the gears. Tried to fold it to take to a bike shop and it won''t fold. Liiks like the hinge was banged up as well. I would not recomment this bike to my worse enemy.Missed the return winodw so I'll have to have the bike shop pick it op. Guessing repairs will put the cost over $600. Not to mention the time wawsted.I am a mature woman that doesn't feel confident on a 2 wheel bike. This bike offers me the safety and security I need to still be able to enjoy a ride outside!I had a bicycle- but decided one fall and I'd be looking at broken hip - this was a perfect solution. Easy to assemble - added a basket & cell phone holder and I was on my wayGreat adult tricycle! It was a little difficult to put together - I had to get help from my neighbor who works with a general assembly company as the directions were very difficult. After assembly, it is a great sturdy bicycle!I’m very glad and love it make feel good ride with my dog and food bag basket too very awesome ride that mophote Adult tricycles bike very awesome for me oh yeah thank you so much